When, on a date, one person thinks there are romantic possiblities, while the other believes it's strictly a friendship outing.
Halluscadating: having the impression that a scheduled meeting with a morsel is a date when in fact, you are being used for timefill or a useful skill
Tom went out with Kate the other night. Kate is too pretty for Tom. Friends, he was kidding himself and should have known it was a mere halluscidate.
Tom knew he was halluscidating when she said he reminded her of her brother.